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loader_test.go
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loader_test.go
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package loader
import (
"context"
"fmt"
"sync/atomic"
"testing"
"time"
"github.com/stretchr/testify/assert"
)
func TestConcurrencySingleKey(t *testing.T) {
var counter int32
fetch := func(ctx context.Context, key string) (string, error) {
atomic.AddInt32(&counter, 1)
time.Sleep(100 * time.Millisecond)
return key, nil
}
l := New(fetch, 500*time.Millisecond, WithErrorTTL(5*time.Second))
type result struct {
dur time.Duration
val interface{}
}
c := make(chan *result, 3)
var start time.Time
var dur time.Duration
start = time.Now()
for i := 0; i < 3; i++ {
go func() {
start := time.Now()
val, _ := l.Load("x")
c <- &result{val: val, dur: time.Now().Sub(start)}
}()
time.Sleep(10 * time.Millisecond)
}
for i := 0; i < 3; i++ {
res := <-c
assert.InDelta(t, 100, res.dur.Milliseconds(), 25, "each get should within 1s")
assert.Equal(t, "x", res.val, "Value must be x")
}
dur = time.Now().Sub(start)
assert.InDelta(t, 100, dur.Milliseconds(), 25, "all get should within 1s")
start = time.Now()
val, _ := l.Load("x")
dur = time.Now().Sub(start)
assert.Less(t, dur.Milliseconds(), int64(50), "After cached get must be fast")
assert.Equal(t, "x", val, "Value must still be x")
assert.Equal(t, int32(1), counter, "fetch must be called once")
}
func TestConcurrencyMultiKey(t *testing.T) {
var counter int32
fetch := func(ctx context.Context, key int) (string, error) {
atomic.AddInt32(&counter, 1)
time.Sleep(100 * time.Millisecond)
return fmt.Sprint(key), nil
}
l := New(fetch, 500*time.Millisecond)
type result struct {
dur time.Duration
val string
}
c := make(chan *result, 3)
var start time.Time
var dur time.Duration
start = time.Now()
for i := 0; i < 3; i++ {
go func(i int) {
start := time.Now()
val, _ := l.Load(i)
c <- &result{val: val, dur: time.Now().Sub(start)}
}(i)
time.Sleep(10 * time.Millisecond)
}
for i := 0; i < 3; i++ {
res := <-c
assert.InDelta(t, 100, res.dur.Milliseconds(), 25, "each get should within 1s")
assert.Equal(t, fmt.Sprint(i), res.val, "Value must be valid")
}
dur = time.Now().Sub(start)
assert.InDelta(t, 100, dur.Milliseconds(), 25, "all get should within 1s")
start = time.Now()
val, _ := l.Load(1)
dur = time.Now().Sub(start)
assert.Less(t, dur.Milliseconds(), int64(50), "After cached get must be fast")
assert.Equal(t, "1", val, "Value must still the same")
assert.Equal(t, int32(3), counter, "fetch must be called once")
}
func TestExpire(t *testing.T) {
var counter int32
fetch := func(ctx context.Context, key string) (string, error) {
atomic.AddInt32(&counter, 1)
time.Sleep(10 * time.Millisecond)
return fmt.Sprintf("%d %s", counter, key), nil
}
l := New(fetch, 500*time.Millisecond)
val, _ := l.Load("x")
assert.Equal(t, "1 x", val, "First call")
assert.Equal(t, int32(1), counter, "fetch called once")
time.Sleep(550 * time.Millisecond)
val, _ = l.Load("x")
assert.Equal(t, "1 x", val, "Use stale value")
val, _ = l.Load("x")
assert.Equal(t, "1 x", val, "Still use stale value")
time.Sleep(100 * time.Millisecond)
val, _ = l.Load("x")
assert.Equal(t, "2 x", val, "Use updated value")
assert.Equal(t, int32(2), counter, "fetch called twice")
}